Contents
What is the characteristics of DC motor?
Generally, three characteristic curves are considered important for DC motors which are, (i) Torque vs. armature current, (ii) Speed vs. armature current and (iii) Speed vs. torque.
Which motors curve characteristics?
The characteristic curves of a given motor are charts that enable us to determine the torque output at a specific speed. This blog explains the DC motor characteristic curves, and how we can use them to select a suitable motor for an application.
What is the function of commutator?
The commutator on the DC generator converts the AC into pulsating DC. The commutator assures that the current from the generator always flows in one direction. The brushes ride on the commutator and make good electrical connections between the generator and the load.
What is a motor performance curve?
Performance curves for gearmotors are central to selecting the correct gearmotor for a given application. They typically display three parameters; speed, torque, and efficiency. Essentially, they combine motor performance and gearbox performance into one graph.
Why do we need DC motor?
Good speed control DC motors offer highly controllable speed. By changing the armature or field voltage it’s possible to achieve wide speed variation and with this level of controllability, DC motors offer the precision required by a wide range of industry applications.
What are the applications of DC motor in present day context?
The various applications of DC shunt motor are in Lathe Machines, Centrifugal Pumps, Fans, Blowers, Conveyors, Lifts, Weaving Machine, Spinning machines, etc.
What are the characteristics of a d.c.motor?
In order to effectively design with D.C. motors, it is necessary to understand their characteristic curves. For every motor, there is a specific Torque/Speed curve and Power curve. The graph above shows a torque/speed curve of a typical D.C. motor.
How does the torque of a DC motor vary?
From equation 6, we surmise that the torque of the series DC motor varies with the square of the armature current (in the linear portion of the magnetization curve). This is shown in Figure 5 by the solid line.
What makes a d.c.motor a self-regulating machine?
makes the d.c. motor a self-regulating machine i.e., it makes the motor to draw as much armature current as is just sufficient to develop the torque required by the load. Back e.m.f. in a d.c. motor regulates the flow of armature current i.e., it automatically changes the armature current to meet the load requirement.
What is the speed equation for a DC motor?
The speed equation for the series DC motor is similar to the shunt, but we must include the series field resistance: In the case of the series DC motor, however, the flux per pole is a function of the armature current.